Jordan and Fa'ck maun. — Fishes of North America. 261 



406. NOTROPIS HETERODOX* (Cope). 



Head 4 ; depth 4; eye Sin head. D. 8 ; A. 8; scales 5-36-3, the lateral 

 line extending about half length of body; teeth 4—4, (sometimes 2, 4-4, 

 2, see below), often crenate. Body moderately stout, the back somewhat 

 elevated. Head rather pointed, the muzzle acuminate. Mouth oblique; 

 lower jaw projecting; upper lip opjiosite upper rim of pupil. Maxillary 

 extending to opposite front of orbit. Tliirteen scales in front of dorsal. 

 Lateral line usually more or less imperfect. Color ol ivaceous ; chin black; 

 a blackish rostral band ; sides with a leaden or dusky band. Length 2^ 

 inches. New York to Michigan and Kansas, common. Variable, (trepo^, 

 varying; ddov^, tooth.) 



Albnniops keterodon, CoPE, Proc. Ac. Nat. Sci. Phila., 1864, 281, Lansing ; Grosse Isle, 

 Michigan. 



Notrnpis gcrmanus, Hay, Proc. U. S. Nat. Mus., 1887, 252, Smoky Hill River, Wallace, 

 Kansas. (T^-pe, No. 37949. Coll. Hay.) 



Notropis heterodon, var., Gilbert, Proc. U. S. Nat. Mus., 1884, 207, Switz City, Indiana, tribu- 

 tary of White River. (Coll. Gilbert.) 



Hybopsi.f heterodon, CoPE, Cypr. Penn., 382, 1866. 



Lencv^cus helerodon, Gunther, Cat., vii, 261, 18G8. 



Hemitremia helerodon, Jordan & Gilbert, Synopsis, 163, 1883. 



Subgenus ALBURNOPS, Girard. 



407. XOTROPIS FRETENSIS (Cope). 



Head 4; depth 5; eye 3i in head, as long as snout. D. 8; A. 8; scales 

 6-35-3; teeth 4-4. Body slender and compressed. Mouth quite oblique, 

 the middle of the premaxillary being opposite line of pupil ; maxillary 

 not reaching to orbit. Seventeen rows of scales in front of dorsal. Lateral 

 line decurved. Olivaceous ; a dark median dorsal band ; a plumbeous 

 silvery lateral shade ; cheeks silvery ; a dark spot at base of caudal; fins 

 plain. Length 2i inches. Detroit River, Michigan. (Cope.) A doubt- 

 ful species, perhaps identical with Xotropis cayxiga. {freiensis, inhabiting 

 fretum or straits, i. e. Detroit River.) 



Ili/hopsisfreleiisis, Cope, Cypr. Penn., 382, 1866, Detroit. 

 Cliola freiensis, Jordan & Gilbert, Synopsis, 167, 1883. 



40S. NOTROPIS BLENNIUS (Girard). 



(Straw-colored Minnow.) 



Head 4; depth 5; eye large, 3 in head. Scales 5-36 (32 to 38)-4; teeth 



4-4. Body moderately stout, little compressed. Head rather broad, with 



rounded angles. Mouth small, inferior, horizontal; snout very obtuso; 



* Notrnpis heterodon. is apparently subject to large variations. The following description is taken 

 from speiimens referred by Dr. Gilbert to this species, although there is a possibility that tha 

 form in <juestion isreally distinct and allied to^. x.Tnoceplialiis : 



Heail 4 ; depth 4;.,. i). 8 ; A. 7 ; lateral line 37, 13 scales before dorsal ; teeth 2, 4-4, 2, with 

 strong grinding surface, the edge of some teeth denticulate. Body slender, compressed, the 

 form and apiiearance as in N. helerodon. Head small, the snout short and rather sharp, slightly 

 decurved. Mouth small, oblique, the maxillary barely reaching front of eye, 4 in head; snout 

 4 ; eye very large, 3 in head. Dorsal inserted just before ventrals ; pectorals not reaching ven- 

 trals. Lateral line complete, little decurved ; scales not crowded. Dark olive above, the scales 

 with dark edges; a dusky streak along sides, ending in a spot at base of caudal, this streak 

 extending forward around snout ; dark specks along jwres of lateral line; a row ors|)ecks along 

 base of anal ; tins unmarked. Tieugth 2 inches. Sluggish streams of Indiana and Illinois. 

 This description taken by Dr. Gilbert from specimens from Switz City Swamp, Indiana. Differs 

 from the ordinary helerodon in the number of toethand in the complete lateral line. 



